mirror of
https://github.com/FabInfra/S22.Sasl.git
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84 lines
3.0 KiB
C#
84 lines
3.0 KiB
C#
using System;
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using System.Collections.Generic;
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namespace S22.Sasl {
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/// <summary>
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/// A factory class for producing instances of Sasl mechanisms.
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/// </summary>
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internal static class SaslFactory {
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/// <summary>
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/// A dictionary of Sasl mechanisms registered with the factory class.
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/// </summary>
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static Dictionary<string, Type> Mechanisms {
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get;
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set;
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}
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/// <summary>
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/// Creates an instance of the Sasl mechanism with the specified
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/// name.
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/// </summary>
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/// <param name="name">The name of the Sasl mechanism of which an
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/// instance will be created.</param>
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/// <returns>An instance of the Sasl mechanism with the specified name.</returns>
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/// <exception cref="ArgumentNullException">The name parameter is null.</exception>
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/// <exception cref="SaslException">A Sasl mechanism with the
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/// specified name is not registered with Sasl.SaslFactory.</exception>
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public static SaslMechanism Create(string name) {
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name.ThrowIfNull("name");
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if (!Mechanisms.ContainsKey(name)) {
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throw new SaslException("A Sasl mechanism with the specified name " +
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"is not registered with Sasl.SaslFactory.");
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}
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Type t = Mechanisms[name];
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object o = Activator.CreateInstance(t, true);
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return o as SaslMechanism;
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}
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/// <summary>
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/// Registers a Sasl mechanism with the factory using the specified name.
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/// </summary>
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/// <param name="name">The name with which to register the Sasl mechanism
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/// with the factory class.</param>
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/// <param name="t">The type of the class implementing the Sasl mechanism.
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/// The implementing class must be a subclass of Sasl.SaslMechanism.</param>
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/// <exception cref="ArgumentNullException">The name parameter or the t
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/// parameter is null.</exception>
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/// <exception cref="ArgumentException">The class represented by the
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/// specified type does not derive from Sasl.SaslMechanism.</exception>
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/// <exception cref="SaslException">The Sasl mechanism could not be
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/// registered with the factory. Refer to the inner exception for error
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/// details.</exception>
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public static void Add(string name, Type t) {
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name.ThrowIfNull("name");
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t.ThrowIfNull("t");
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if (!t.IsSubclassOf(typeof(SaslMechanism))) {
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throw new ArgumentException("The type t must be a subclass " +
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"of Sasl.SaslMechanism");
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}
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try {
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Mechanisms.Add(name, t);
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} catch (Exception e) {
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throw new SaslException("Registration of Sasl mechanism failed.", e);
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}
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}
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/// <summary>
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/// Static class constructor. Initializes static properties.
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/// </summary>
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static SaslFactory() {
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Mechanisms = new Dictionary<string, Type>(
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StringComparer.InvariantCultureIgnoreCase);
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// Could be moved to App.config to support SASL "plug-in" mechanisms.
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var list = new Dictionary<string, Type>() {
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{ "PLAIN", typeof(Sasl.Mechanisms.SaslPlain) },
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{ "DIGEST-MD5", typeof(Sasl.Mechanisms.SaslDigestMd5) },
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{ "SCRAM-SHA-1", typeof(Sasl.Mechanisms.SaslScramSha1) },
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};
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foreach (string key in list.Keys)
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Mechanisms.Add(key, list[key]);
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}
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}
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}
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